Step 1:
The first step to converting 312121.43161356 to a fraction is to re-write 312121.43161356 in the form p/q where p and q are both positive integers. To start with, 312121.43161356 can be written as simply 312121.43161356/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 312121.43161356, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 312121.43161356/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 312121.43161356/1 each by 100000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 312121.43161356 as a fraction:
624243/2 / 1